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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd14aeba1e8a401d4a0458e56865b7db4273d9f61ae3eea9d7f3b10a186173c' 
  AND token = 'i6DcA0aYtbfhI35/2G2zq1ur2wjZUkdWSZXTlK2PNJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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