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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f988bc31f608cd690a6467a5b3b8b8dbae288ba99aafd5ca79a83ef24bc6894' 
  AND token = 'vJSWFoBtYmcNdXPJR+Zcxe+EXITqMXMGGv1ABEFYuak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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