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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bb7a742c67bf4f3e3b60ad63d0ecd0e89039574b8ab2f802ca7fd74bcf4f30' 
  AND token = 'DT3oO+ubdiN9YEH9nGg7/E26svoo/yb59NQmGDckYhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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