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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da638c85d77f4e0a8f4ce83bff2b83b74d06728e8a87ab6ce3f7e1a169ddc0' 
  AND token = 'Ry47p99y3a9CkBqWUwnCzlK7uCW8dfDrtQIcpCT3FdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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