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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40a0a0b6a96131185104089e5bdaf4e98b813467741f14ea57bf6d4b4bf149c' 
  AND token = 'zOpmEz0ZAUix5z3JzlaK62Nm/8j5iR+tLA4xl+g/zeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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