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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c6cd546f81348b17f9cbd85361b92c52acb76d42675a665723b7e7a0c90c78' 
  AND token = 'VNSty/mvFTJ0wfH/+7p2Fnyt5/WjB2QUtYF/wNPx7Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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