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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ede86ad2d0b2eb0c58fc0fa6fb888a885cd8d704b8a19b0e8786f91fd426569' 
  AND token = '9AGtuq3kNQf7y3tgUzjZ/Bosj3edZmaz/5ky2oirUpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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