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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32daccd1c02911a517aca13b495dcc93850d6a3446b26a0759c505b3db5e494f' 
  AND token = '0OEBzmEZWlKidG24OS4KZVGhclrHZFM47WSnXXTwEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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