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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45fdd57b27556eee93a73d58372c9237a4c334b196df4de23edb9248ce9ed17' 
  AND token = '/fSQiDCnbDZw9bQPb4PkcgxjHVNvEbbX82OoHysaNMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}