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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdc7ad6671e3b9edf8c5e006c9ecebf126664c2eacb259ccacfcf5df333575e' 
  AND token = '3TdQ7L4J1yDm15nPXH1gCykESZpn4xP88VE6QgpiPoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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