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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112e7edda2ba039393264a17a537bd215f68510e2af3b6ca67de762dbd6689ef' 
  AND token = 'Ng4mLmXezgEIK6/cMV30i9JfmDdtlcuvHEe1uRXcyb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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