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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1d52fbd115a7fbb7e99a3316273663e85c64244fba6425ae9fdde339061b85' 
  AND token = 'N2GXhEGZHDA5Yi4+mWuassJ0ep7N07kayNc6jSl35Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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