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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85607d17c608c9e8c045cbb39f2f1498cca4a6b019ab9af17d27dc104326e54e' 
  AND token = '//2EWKx3/c8Wjm+9MocKu79xhmsKDF0RyINWLLEgsOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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