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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7a258ef2d84aeee4836975f17f9331af646e754efcfe8a313f3239836c3ef5' 
  AND token = 'oScAUpR2NbrR5kRlfmRHSoP1prKYRJDqPhIjElNdNq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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