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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebc8ca2c43dab237a5290a2c7adbc7fd4caa4aa96f9fa2b38e6c9cafd9b86e0' 
  AND token = '/kDLRlBv9qJhFAG3YNy3wHhqAx1J/xD2/jr309OdTCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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