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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f654f32d637d281a72870c36706639fbbd970ff1869ded24cd00e83664ec39a0' 
  AND token = '5FSRurJsYbywmNvobVwoS3FvwPFgv2d7XBblVy4SEJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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