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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fd8f3160dd1685d299a94c75414b96fc79a6651934c414eabaf2fe4a7e0186' 
  AND token = 'Dhn7AL52nF7M/Dvv8u6UWfvn90mZGm4vlVItNySP1v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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