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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad03462eac086a028bf65a7451371a0a56f0f6a5d96a6abb8d8fe4591791548' 
  AND token = 'zfFyFThvJUZzSxpaX+rkVvZy57pYiecXSU6B+SC6/mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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