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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861f7fa2bfa6600cbdb6af3101e069e273f52384026e12933ffd84d8f10d5446' 
  AND token = 'R1Sg+X7hID2vgPG9GLdAs4rLb3nseIBrV/i241oLdFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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