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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd233d240dd8e0b95e2d4528dd1d9bebd0ac92b941dc33d5fa0eba7b300b47f01' 
  AND token = 'jsXI/9Xqj94OhDW8trbgcj0U5rpmIoFO2PcN2lg7kvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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