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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae2037d347a5587b2d6b202c2b4a158d67e9026ca1409c620eaddb713f51a0b' 
  AND token = 'uvg7XoncoAkv50lxfxa6D4WDtN9vBcPpSWvEVcf2tL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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