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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993bc4d7e17de7f6e2791156716b0dd6a146dba40470d67b3c4901b07abad708' 
  AND token = 'LY6dgYSI2IDHU42v4lumwiUxqGPCAwjIVCP0ujPTCjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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