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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1d1e643e9a1ff4f752dca243a9d554c3ebb4505bb82259291fa1d807a61e89' 
  AND token = 'V76OLbZrPJHochs89O78V16l9W1nVWP6g07yBlPc3P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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