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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdc98d3d9e7c6f6e4434783d77475952540e99a4e82c90a611b111a1fa75865' 
  AND token = 'OuzNQKSKeL5oxM36tOcwCtcXU5dA/BB7Pf0Bg6K5HwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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