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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a93e7b0b94a22306d606762a796ec69e91e2580d51fb0e3da5b7be0c88ebd0' 
  AND token = '27nsj3ZU7dgbdWoRAZfVfTRcAL+Jnurl5l+21KcdHeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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