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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe6e02ca1a7845b77df5f924711d8175578fc9f94130a54e0c4c76e34bb9e89' 
  AND token = 'm5Iu66qmfxnKR5sNk9C/OVFMnajD8L7fQ6aRBQBeHIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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