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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639e5d6cf400b746a0994728b39d5f1f43700d7d58d6f1b98bdb8454610a50e8' 
  AND token = 'dpvsPO+Cg0RAgRgZc2l+4udAObi+aYvWTq6DyVNddL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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