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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ce6c09abd35ca912fe8b4287132b3bb8642aeba8a5bd37d36bb19a800cfcb9' 
  AND token = 'OmEXrnWvy4Vfc3FdHh9uvwD4sg1bVsG1/lWcze7jVvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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