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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bd5ab1617942acaa11d3c1976c55334fc02aa864d9754e2b0b4310e2bb8446' 
  AND token = 'VE99KBBFwAEwDTJ80v6JocLiol6U4i5cpA+c0TQHZp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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