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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e12b1912c546764bdd806caecbf9cb2fa59dc0af37e1a23677e9bc31c7653a' 
  AND token = '/zHTfF7Lqx5pGzUFgy3ze/IE7DrANlsjla/6fbs7Scg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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