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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3029b32647b04fe5e996a931cb9538b6b66ee312a38788ea3ae7b43cc728467e' 
  AND token = 'jqDf7sv9JGGQ0yoKtCFy9f2VKht37n+6m1ethk+SfEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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