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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb45caaba389ade95d9e2a6d76f10dbf0e531055febedf6a4fd8a05019e9b357' 
  AND token = 'kUgV0UjHBIR5okkTlpRr5EE/aSpYORzNfi47VOeHoDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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