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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84200ee7e0b15625116f3142b2edab9636882640f0d635bbb9c76e6d0f041771' 
  AND token = '0ie4gKh+h9rXoEDgQD8F2QfVsnmw2PEz+JoIdXOrPMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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