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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0365ff652f364d78675f733e1ef1a8c1b523946ce837294c9ff559ad6a053aa' 
  AND token = 'E1dm2ofelIm7qG/d36afTAztp96Q4+4iBHcE0Z4DR38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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