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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be314847fceecc65baaacb1c2c43452e8290e8a7e7b0e5bd3fc1117b5dbac93b' 
  AND token = '2QMK5yQl66BK6v2PXW8orUyYtuHFjrWuCba1wMJN42M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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