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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c467cbd0c457562613ad5e0255d3ae12faa0e9af7185db206b521f279aaba0' 
  AND token = 'LvCmt3clzKkIZQ9xWgYF/csEnfh9mfDFiIjNna07LF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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