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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e61a5896162698092b42b4eb2f5c863fa6b08849188f0eed6ff4e6f19323f6b' 
  AND token = 'ChnES5gWayclBEpIhJMqcP9zlcBw+7RfNSl+8gi7zfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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