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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca3b4f14b364aea6f4fecfc8e3a542fb35a6371be8ffa5507b2c4c5951c7d5e' 
  AND token = '6AwSu8mk8krYiiZO/fduXfNEhVpUXiodFCGoT5lIHR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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