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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e984d6c3313ec47e2c37f35494e71865ee336b5f773b54ba04bfc573de6d273' 
  AND token = 'FerpdS618bb/ZrPT6K4NcYs9CT8QVS675mKIMpQ/H+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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