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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c90cea42a421f4c1d2cd34e185f6e4dbd7d7b6d3f7688a92068175508cee0be' 
  AND token = 'FhXpR30I4frGEbtTbLQSlwmWXmv8RbaACLIc7Obmi20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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