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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f350c71ccdaa850558b338e3c51512b80008efeec7895a860032a8fa949525c' 
  AND token = '7OcrzMqIAeTZNig9n3Z/JBmkz8aeDNRpxGeqc6aGY2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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