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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b95d6fd9933a5c5c71f58d07eca550339479cec3a3150c217d403508e4a9a1' 
  AND token = 'ErikOFdSfovxxfdxMqcsXuxKgWogZoryR2qKPolrehw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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