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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f8b30d2f70efe04a1a2d880bd54e779c3a843c9c8320947336c4bead76c8ec' 
  AND token = 'a9qUu5jFP9KgOS1xKe8uJG/OXFp+UXauxLd4QKVNXh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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