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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da967a9793bf490dcdde069ff1b595a8e7c01dce3ed440452c04e68a3e2e4541' 
  AND token = 'AIWg7BhHA0O90Qwo9aUA/PS0LpHn8CYmiIOYQWSgsS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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