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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de0b8a95b1970184b20100eb23d0ef350323aea8122e01ddd13aece60ceab4a' 
  AND token = 'yqcrmVMxcCSsZk+1L33sRKqlWvO32gSygpmBHLU8324=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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