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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bac1cbc8c71729759a92efb077c8f49d87f5e9baed4a6e0fa6e156b01d70a5' 
  AND token = 'UR2gtvMFocfYaitB5UM969h2Tq6RRGOnUhA4VfsEgW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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