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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0518d52b9aea7c4a2e8f49ffc339b3f001ceb0485898b2bd47a57ef2a4c271' 
  AND token = 'CsF3ZGBEepDzbHFRvj1bTuEnuADypOUr1N95h1I2szI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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