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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d20f460cabe0beb75d208d61a09afcab97bb418e99cce3e2102bd07a87c805d' 
  AND token = '9nBmjnWhvOYxs5T0yLOatUeRv79Csa7Q9kNBvomCaYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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