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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98853d018b6eff85aebef3da3398c97cf0d9f0190c57e5620fd333d3b80b6bd0' 
  AND token = 'PCj6cBi6Mcl3kBJ7qND9N8HaXUsJ09DpYFNL4aW3e/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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