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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddafc1f487a821a1c173057e5f2910eb45ef455ecd96b6d21e90fddcd094387' 
  AND token = 'rlZIX2z7fFtLhe1OnqBldW8uAffmK37AeJ63P7lz8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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