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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea79c765c4b1624946e77d737e4e328c745b011d2c289055f986dd7b16236512' 
  AND token = '6ZgBP5ke3OHub/1U22m6UmalZO4l67VvLQoX0nVq8zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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