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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffb5d9a2bdace8c88fa58d12dc9c4f9b9235fe86249467d57d2f2d0d2bfc3b3' 
  AND token = 'lQFnoWoHMw5U+5WsUPFmcp5VANu/OStOs+/rsZ3nhtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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