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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c8c966afdeac770270e0a981b09689e2273dade5c7a90804f8966857c081bf' 
  AND token = 'SV1E0jS+JVgKU+e8aqC6yIHOW5Q2Z43YeGDoClJqiIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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