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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d289dcbaeb4f85814aa1288fb94b6cd6438375813e2767889e6f8b9305dcb76' 
  AND token = '5VSIS0MsEAwJ6vsHaN8Q4llZInllJiEclmQqUUUxPjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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