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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d864e00e79a22e24fb3fd1bdfd7761c3d7b3d2f0b5306c7f8d9c8bb5d735afd' 
  AND token = 'gYDW6A9hQ2G81coZjOaZrG1VN+0G4gUnY+28Z8v1zrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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