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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fa69813591c45f4a4f40e1f49902600d4303c9c0cb2eade8c439e7ca974e83' 
  AND token = 'srKmfFBL6jpKkG2xa0I3IyBvzQgta7YrcDKe3Ubcpj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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