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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b837f4866eda5dd7594f3219bd709510eb088f9fff56ec30f83b33bdfbe26e8' 
  AND token = 'XufkFsqLu7G4EIiHyIAtDn4uv4xIpzmALOnvS6GbhTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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