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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc334750a379bc208459ef12bbdd522571f33a2093ca80bef9065d570ff5ae42' 
  AND token = '32tQ5TCIhtp0wLfHK53Atg7ugFP04NwAZxb1cOqZ5SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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