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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4fb7a470e63b3f29f92b2b4a7b5d360627f76146d0c10aaec36605351ed87d' 
  AND token = 'ors85YgauSIUUjWSaoBZ8eL1SJ/n4VN67zOJqhaNueQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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